InChI=1S/C21H30O8/c1-8-4-5-11-9(2)13(6-12-10(3)20(26)29-19(12)15(8)11)27-21-18(25)17(24)16(23)14(7-22)28-21/h10-19,21-25H,1-2,4-7H2,3H3